AddEtcdMember adds an etcd member.

CheckClusterID checks Etcd's cluster ID, returns an error if mismatch.

ListEtcdMembers returns a list of internal etcd members.

RemoveEtcdMember removes a member by the given id.

WaitEtcdStart checks etcd starts ok or not.

DefaultDialTimeout is the maximum amount of time a dial will wait for a connection to setup.

DefaultRequestTimeout 10s is long enough for most of etcd clusters.

DefaultSlowRequestTime 1s for the threshold for normal request, for those longer then 1s, they are considered as slow requests.